package com.securecrt;

import android.util.Log;

import com.chilkatsoft.*;

public class CkSshClient {

	String user, pass, host;
	int port;
	

    //  Important: It is helpful to send the contents of the
    //  ssh.LastErrorText property when requesting support.

    CkSsh ssh = new CkSsh();

    public CkSshClient(String user, String pass, String host, int port) {
		this.user = user;
		this.pass = pass;
		this.host = host;
		this.port = port;
	}
    
    public String SendReqExec(String command){
    	String outStr = "";
    //  Any string automatically begins a fully-functional 30-day trial.
        boolean success;
        success = ssh.UnlockComponent("Anything for 30-day trial");
        if (success != true) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Connect to an SSH server:
        String hostname;
        int port;

        //  Hostname may be an IP address or hostname:
        hostname = this.host;
        port = this.port;

        success = ssh.Connect(hostname,port);
        if (success != true) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", "Hostname error: "+ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Wait a max of 5 seconds when reading responses..
        ssh.put_IdleTimeoutMs(5000);

        //  Authenticate using login/password:
        success = ssh.AuthenticatePw(this.user,this.pass);
        if (success != true) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", "Username or password error:" + ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Open a session channel.  (It is possible to have multiple
        //  session channels open simultaneously.)
        int channelNum;
        channelNum = ssh.OpenSessionChannel();
        if (channelNum < 0) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  The SendReqExec method starts a command on the remote
        //  server.   The syntax of the command string depends on the
        //  default shell used on the remote server to run the command.
        //  On Windows systems it is CMD.EXE.  On UNIX/Linux
        //  systems the user's default shell is typically defined in /etc/password.

        //  Here are some examples of command lines for <b>Windows SSH servers</b>:

        //  Get a directory listing:
        String cmd1;
        cmd1 = "dir";

        //  Do a nameserver lookup:
        String cmd2;
        cmd2 = "nslookup chilkatsoft.com";

        //  List a specific directory.  Given that the shell is CMD.EXE, backslashes must
        //  be used:
        String cmd3;
        cmd3 = "dir \\temp";

        //  Execute a sequence of commands.  The syntax for CMD.EXE may be found
        //  here: http://technet.microsoft.com/en-us/library/bb490880.aspx.  Notice how the commands
        //  are separated by "&&" and the entire command must be enclosed in quotes:
        String cmd4;
        cmd4 = "\"cd \\temp&&dir\"";

        //  Here are two examples of command lines for <b>Linux/UNIX SSH servers</b>:

        //  Get a directory listing:
        String cmd5;
        cmd5 = "ls -l /tmp";

        //  Run a series of commands (syntax may depend on your default shell):
        String cmd6;
        cmd6 = "cd /etc; ls -la";

        //  Request a directory listing on the remote server:
        //  If your server is Windows, change the string from "ls" to "dir"
        success = ssh.SendReqExec(channelNum,command);
        if (success != true) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Read whatever output may already be available on the
        //  SSH connection.  ChannelReadAndPoll returns the number of bytes
        //  that are available in the channel's internal buffer that
        //  are ready to be "picked up" by calling GetReceivedText
        //  or GetReceivedData.
        //  A return value of -1 indicates failure.
        //  A return value of -2 indicates a failure via timeout.

        //  The ChannelReadAndPoll method waits
        //  for data to arrive on the connection usingi the IdleTimeoutMs
        //  property setting.  Once the first data arrives, it continues
        //  reading but instead uses the pollTimeoutMs passed in the 2nd argument:
        //  A return value of -2 indicates a timeout where no data is received.
        int n;
        int pollTimeoutMs;
        pollTimeoutMs = 2000;
        n = ssh.ChannelReadAndPoll(channelNum,pollTimeoutMs);
        if (n < 0) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Close the channel:
        success = ssh.ChannelSendClose(channelNum);
        if (success != true) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Perhaps we did not receive all of the commands output.
        //  To make sure,  call ChannelReceiveToClose to accumulate any remaining
        //  output until the server's corresponding "channel close" is received.
        success = ssh.ChannelReceiveToClose(channelNum);
        if (success != true) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Let's pickup the accumulated output of the command:
        String cmdOutput;
        cmdOutput = ssh.getReceivedText(channelNum,"ansi");
        if (cmdOutput == null ) {
            outStr += ssh.lastErrorText() + "\n";
            Log.d("CkSsh.Con.Exec", ssh.lastErrorText()+ "\n");
            //return;
        }

        //  Display the remote shell's command output:
        outStr += cmdOutput + "\n";

        //  Disconnect
        ssh.Disconnect();
        return outStr;
    }
   
    static {
        // Important: Make sure the name passed to loadLibrary matches the shared library
        // found in your project's libs/armeabi directory.
        //  for "libchilkat.so", pass "chilkat" to loadLibrary
        //  for "libchilkatemail.so", pass "chilkatemail" to loadLibrary
        //  etc.
        // 
        System.loadLibrary("chilkat");

        // Note: If the incorrect library name is passed to System.loadLibrary,
        // then you will see the following error message at application startup:
        //"The application <your-application-name> has stopped unexpectedly. Please try again."
    }

}
